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Large Reasoning Models (LRMs) like DeepSeek-R1 and OpenAI-o1 have demonstrated remarkable reasoning capabilities, raising important questions about their biases in LLM-as-a-judge settings. We present a comprehensive benchmark comparing…

Computers and Society · Computer Science 2025-04-21 Qian Wang , Zhanzhi Lou , Zhenheng Tang , Nuo Chen , Xuandong Zhao , Wenxuan Zhang , Dawn Song , Bingsheng He

This paper presents a systematic analysis of biases in open-source Large Language Models (LLMs), across gender, religion, and race. Our study evaluates bias in smaller-scale Llama and Gemma models using the SALT ($\textbf{S}$ocial…

Computation and Language · Computer Science 2025-02-19 Samee Arif , Zohaib Khan , Maaidah Kaleem , Suhaib Rashid , Agha Ali Raza , Awais Athar

We explore the internal mechanisms of how bias emerges in large language models (LLMs) when provided with ambiguous comparative prompts: inputs that compare or enforce choosing between two or more entities without providing clear context…

Computation and Language · Computer Science 2024-10-31 Rishabh Adiga , Besmira Nushi , Varun Chandrasekaran

Recent studies have demonstrated that large language models (LLMs) exhibit significant biases in evaluation tasks, particularly in preferentially rating and favoring self-generated content. However, the extent to which this bias manifests…

Computation and Language · Computer Science 2025-12-09 Yen-Shan Chen , Jing Jin , Peng-Ting Kuo , Chao-Wei Huang , Yun-Nung Chen

Large Language Models (LLMs) have been shown to exhibit various biases and stereotypes in their generated content. While extensive research has investigated biases in LLMs, prior work has predominantly focused on explicit bias, with minimal…

Computation and Language · Computer Science 2025-06-04 Yachao Zhao , Bo Wang , Yan Wang , Dongming Zhao , Ruifang He , Yuexian Hou

The paradigm of using Large Language Models (LLMs) and Multimodal Large Language Models (MLLMs) as evaluative judges has emerged as an effective approach in RLHF and inference-time scaling. In this work, we propose Multimodal Reasoner as a…

Computation and Language · Computer Science 2025-05-20 Renjie Pi , Felix Bai , Qibin Chen , Simon Wang , Jiulong Shan , Kieran Liu , Meng Cao

Large Language Models (LLMs) push the bound-aries in natural language processing and generative AI, driving progress across various aspects of modern society. Unfortunately, the pervasive issue of bias in LLMs responses (i.e., predictions)…

Computation and Language · Computer Science 2025-05-20 Isabela Pereira Gregio , Ian Pons , Anna Helena Reali Costa , Artur Jordão

LLM-as-a-Judge has emerged as a promising tool for automatically evaluating generated outputs, but its reliability is often undermined by potential biases in judgment. Existing efforts to mitigate these biases face key limitations:…

Computation and Language · Computer Science 2025-10-29 Haoyan Yang , Runxue Bao , Cao Xiao , Jun Ma , Parminder Bhatia , Shangqian Gao , Taha Kass-Hout

Large Language Models (LLMs) have demonstrated impressive performance in biomedical relation extraction, even in zero-shot scenarios. However, evaluating LLMs in this task remains challenging due to their ability to generate human-like…

Computation and Language · Computer Science 2025-06-03 Md Tahmid Rahman Laskar , Israt Jahan , Elham Dolatabadi , Chun Peng , Enamul Hoque , Jimmy Huang

In this paper, we uncover a systematic bias in the evaluation paradigm of adopting large language models~(LLMs), e.g., GPT-4, as a referee to score and compare the quality of responses generated by candidate models. We find that the quality…

Computation and Language · Computer Science 2023-08-31 Peiyi Wang , Lei Li , Liang Chen , Zefan Cai , Dawei Zhu , Binghuai Lin , Yunbo Cao , Qi Liu , Tianyu Liu , Zhifang Sui

As large language models take on growing roles as automated evaluators in practical settings, a critical question arises: Can individuals persuade an LLM judge to assign unfairly high scores? This study is the first to reveal that…

Computation and Language · Computer Science 2025-08-12 Yerin Hwang , Dongryeol Lee , Taegwan Kang , Yongil Kim , Kyomin Jung

As large language models (LLMs) continue to advance, reliable evaluation methods are essential particularly for open-ended, instruction-following tasks. LLM-as-a-Judge enables automatic evaluation using LLMs as evaluators, but its…

Computation and Language · Computer Science 2025-06-17 Yusuke Yamauchi , Taro Yano , Masafumi Oyamada

Large Language Models (LLMs) have shown powerful performance and development prospects and are widely deployed in the real world. However, LLMs can capture social biases from unprocessed training data and propagate the biases to downstream…

Computation and Language · Computer Science 2024-02-22 Yingji Li , Mengnan Du , Rui Song , Xin Wang , Ying Wang

Large Language Models (LLMs) have demonstrated remarkable progress through preference-based fine-tuning, which critically depends on the quality of the underlying training data. While human feedback is essential for improving data quality,…

Artificial Intelligence · Computer Science 2025-10-31 Derin Cayir , Renjie Tao , Rashi Rungta , Kai Sun , Sean Chen , Haidar Khan , Minseok Kim , Julia Reinspach , Yue Liu

The evaluation bottleneck in recommendation systems has become particularly acute with the rise of Generative AI, where traditional metrics fall short of capturing nuanced quality dimensions that matter in specialized domains like legal…

Computation and Language · Computer Science 2025-12-30 Anu Pradhan , Alexandra Ortan , Apurv Verma , Madhavan Seshadri

Large language models (LLMs) are increasingly used as automated judges to evaluate recommendation systems, search engines, and other subjective tasks, where relying on human evaluators can be costly, time-consuming, and unscalable. LLMs…

Computation and Language · Computer Science 2025-02-10 Gerrit J. J. van den Burg , Gen Suzuki , Wei Liu , Murat Sensoy

Benchmark contamination has become a significant concern in the LLM evaluation community. Previous Agents-as-an-Evaluator address this issue by involving agents in the generation of questions. Despite their success, the biases in…

Artificial Intelligence · Computer Science 2025-05-13 Meilin Chen , Jian Tian , Liang Ma , Di Xie , Weijie Chen , Jiang Zhu

While Large Language Models (LLMs) have become ubiquitous in many fields, understanding and mitigating LLM biases is an ongoing issue. This paper provides a novel method for evaluating the demographic biases of various generative AI models.…

Computation and Language · Computer Science 2025-06-16 Jack H Fagan , Ruhaan Juyaal , Amy Yue-Ming Yu , Siya Pun

Large language models (LLMs) inherit biases from their training data and alignment processes, influencing their responses in subtle ways. While many studies have examined these biases, little work has explored their robustness during…

Computation and Language · Computer Science 2024-11-06 Virgile Rennard , Christos Xypolopoulos , Michalis Vazirgiannis

Evaluating large language model (LLM) outputs in the legal domain presents unique challenges due to the complex and nuanced nature of legal analysis. Current evaluation approaches either depend on reference data, which is costly to produce,…